Application Of The Cubed-Sphere Grid To Tilted Black Hole Accretion Disks

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dc.contributor.utaustinauthorLindner, Christopher C.en_US
dc.creatorFragile, P. Chrisen_US
dc.creatorLindner, Christopher C.en_US
dc.creatorAnninos, Peteren_US
dc.creatorSalmonson, Jay D.en_US
dc.date.accessioned2016-04-28T22:21:59Z
dc.date.available2016-04-28T22:21:59Z
dc.date.issued2009-01en
dc.description.abstractIn recent work we presented the first results of global general relativistic magnetohydrodynamic (GRMHD) simulations of tilted (or misaligned) accretion disks around rotating black holes. The simulated tilted disks showed dramatic differences from comparable untilted disks, such as asymmetrical accretion onto the hole through opposing "plunging streams" and global precession of the disk powered by a torque provided by the black hole. However, those simulations used a traditional spherical-polar grid that was purposefully under-resolved along the pole, which prevented us from assessing the behavior of any jets that may have been associated with the tilted disks. To address this shortcoming we have added a block-structured "cubed-sphere" grid option to the Cosmos++ GRMHD code, which will allow us to simultaneously resolve the disk and polar regions. Here we present our implementation of this grid and the results of a small suite of validation tests intended to demonstrate that the new grid performs as expected. The most important test in this work is a comparison of identical tilted disks, one evolved using our spherical-polar grid and the other with the cubed-sphere grid. We also demonstrate an interesting dependence of the early-time evolution of our disks on their orientation with respect to the grid alignment. This dependence arises from the differing treatment of current sheets within the disks, especially whether or not they are aligned with symmetry planes of the grid.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipCollege of Charlestonen_US
dc.description.sponsorshipSouth Carolina Space Grant Consortiumen_US
dc.description.sponsorshipU. S. Department of Energy by Lawrence Livermore National Laboratory DE-AC52-07NA27344en_US
dc.description.sponsorshipNational Science Foundationen_US
dc.description.sponsorshipBarcelona Supercomputing Center AECT-2007-3-0002en_US
dc.identifierdoi:10.15781/T23F9W
dc.identifier.Filename2009_01_tiltedblackhole.pdfen_US
dc.identifier.citationFragile, P. Chris, Christopher C. Lindner, Peter Anninos, and Jay D. Salmonson. "Application of the cubed-sphere grid to tilted black hole accretion disks." The Astrophysical Journal, Vol. 691, No. 1 (Jan., 2009): 482.en_US
dc.identifier.doi10.1088/0004-637x/691/1/482en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35205
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectaccretion, accretion disksen_US
dc.subjectblack hole physicsen_US
dc.subjectmethods: numericalen_US
dc.subjectmhden_US
dc.subjectrelativityen_US
dc.subjectrelativistic magnetohydrodynamicsen_US
dc.subject3-dimensional simulationsen_US
dc.subjectinstabilityen_US
dc.subjectequationsen_US
dc.subjecttransporten_US
dc.subjectflowsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleApplication Of The Cubed-Sphere Grid To Tilted Black Hole Accretion Disksen_US
dc.typeArticleen_US

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